    /**
     * Provides a convenient wrapper for normalized keyboard navigation. KeyNav allows you to bind navigation keys to
     * function calls that will get called when the keys are pressed, providing an easy way to implement custom navigation
     * schemes for any UI component.
     *
     * The following are all of the possible keys that can be implemented: enter, space, left, right, up, down, tab, esc,
     * pageUp, pageDown, del, backspace, home, end.
     *
     * Usage:
     *
     *     var nav = new Ext.util.KeyNav({
     *         target : "my-element",
     *         left   : function(e){
     *             this.moveLeft(e.ctrlKey);
     *         },
     *         right  : function(e){
     *             this.moveRight(e.ctrlKey);
     *         },
     *         enter  : function(e){
     *             this.save();
     *         },
     *
     *         // Binding may be a function specifiying fn, scope and defaultAction
     *         esc: {
     *             fn: this.onEsc,
     *             defaultEventAction: false
     *         },
     *         scope : this
     *     });
     */
    Ext.define('Ext.util.KeyNav', {
        alternateClassName: 'Ext.KeyNav',

        requires: ['Ext.util.KeyMap'],

        statics: {
            keyOptions: {
                left: 37,
                right: 39,
                up: 38,
                down: 40,
                space: 32,
                pageUp: 33,
                pageDown: 34,
                del: 46,
                backspace: 8,
                home: 36,
                end: 35,
                enter: 13,
                esc: 27,
                tab: 9
            }
        },

        constructor: function(config) {
            var me = this;
            if (arguments.length === 2) {
                me.legacyConstructor.apply(me, arguments);
                return;
            }
            me.setConfig(config);
        },

        /**
         * @private
         * Old constructor signature.
         * @param {String/HTMLElement/Ext.Element} el The element or its ID to bind to
         * @param {Object} config The config
         */
        legacyConstructor: function(el, config) {
            this.setConfig(Ext.apply({
                target: el
            }, config));
        },

        /**
         * Sets up a configuration for the KeyNav.
         * @private
         * @param {String/HTMLElement/Ext.Element} el The element or its ID to bind to
         * @param {Object} config A configuration object as specified in the constructor.
         */
        setConfig: function(config) {
            var me = this,
                keymapCfg = {
                    target: config.target,
                    eventName: me.getKeyEvent('forceKeyDown' in config ? config.forceKeyDown : me.forceKeyDown, config.eventName)
                },
                map, keyCodes, defaultScope, keyName, binding;

            if (me.map) {
                me.map.destroy();
            }

            if (config.processEvent) {
                keymapCfg.processEvent = config.processEvent;
                keymapCfg.processEventScope = config.processEventScope||me;
            }
            map = me.map = new Ext.util.KeyMap(keymapCfg);
            keyCodes = Ext.util.KeyNav.keyOptions;
            defaultScope = config.scope || me;

            for (keyName in keyCodes) {
                if (keyCodes.hasOwnProperty(keyName)) {

                    // There is a property named after a key name.
                    // It may be a function or an binding spec containing handler, scope and defaultAction configs
                    if (binding = config[keyName]) {
                        if (typeof binding === 'function') {
                            binding = {
                                handler: binding,
                                defaultAction: (config.defaultEventAction !== undefined) ? config.defaultEventAction : me.defaultEventAction
                            };
                        }
                        map.addBinding({
                            key: keyCodes[keyName],
                            handler: Ext.Function.bind(me.handleEvent, binding.scope||defaultScope, binding.handler||binding.fn, true),
                            defaultEventAction: (binding.defaultEventAction !== undefined) ? binding.defaultAction : me.defaultEventAction
                        });
                    }
                }
            }

            map.disable();
            if (!config.disabled) {
                map.enable();
            }
        },

        /**
         * Method for filtering out the map argument
         * @private
         * @param {Number} keyCode
         * @param {Ext.EventObject} event
         * @param {Object} options Contains the handler to call
         */
        handleEvent: function(keyCode, event, handler){
            return handler.call(this, event);
        },

        /**
         * @cfg {Boolean} disabled
         * True to disable this KeyNav instance.
         */
        disabled: false,

        /**
         * @cfg {String} defaultEventAction
         * The method to call on the {@link Ext.EventObject} after this KeyNav intercepts a key. Valid values are {@link
         * Ext.EventObject#stopEvent}, {@link Ext.EventObject#preventDefault} and {@link Ext.EventObject#stopPropagation}.
         *
         * If a falsy value is specified, no method is called on the key event.
         */
        defaultEventAction: "stopEvent",

        /**
         * @cfg {Boolean} forceKeyDown
         * Handle the keydown event instead of keypress. KeyNav automatically does this for IE since IE does not propagate
         * special keys on keypress, but setting this to true will force other browsers to also handle keydown instead of
         * keypress.
         */
        forceKeyDown: false,

        /**
         * @cfg {Ext.Component/Ext.Element/HTMLElement/String} target
         * The object on which to listen for the event specified by the {@link #eventName} config option.
         */

        /**
         * @cfg {String} eventName
         * The event to listen for to pick up key events.
         */
        eventName: 'keypress',

        /**
         * @cfg {Function} processEvent
         * An optional event processor function which accepts the argument list provided by the {@link #eventName configured
         * event} of the {@link #target}, and returns a keyEvent for processing by the KeyMap.
         *
         * This may be useful when the {@link #target} is a Component with s complex event signature. Extra information from
         * the event arguments may be injected into the event for use by the handler functions before returning it.
         */

        /**
         * @cfg {Object} [processEventScope=this]
         * The scope (`this` context) in which the {@link #processEvent} method is executed.
         */

        /**
         * Destroy this KeyNav (this is the same as calling disable).
         * @param {Boolean} removeEl True to remove the element associated with this KeyNav.
         */
        destroy: function(removeEl){
            this.map.destroy(removeEl);
            delete this.map;
        },

        /**
         * Enables this KeyNav.
         */
        enable: function() {
            this.map.enable();
            this.disabled = false;
        },

        /**
         * Disables this KeyNav.
         */
        disable: function() {
            this.map.disable();
            this.disabled = true;
        },

        /**
         * Convenience function for setting disabled/enabled by boolean.
         * @param {Boolean} disabled
         */
        setDisabled : function(disabled){
            this.map.setDisabled(disabled);
            this.disabled = disabled;
        },

        /**
         * @private
         * Determines the event to bind to listen for keys. Defaults to the {@link #eventName} value, but
         * may be overridden the {@link #forceKeyDown} setting.
         *
         * The useKeyDown option on the EventManager modifies the default {@link #eventName} to be `keydown`,
         * but a configured {@link #eventName} takes priority over this.
         *
         * @return {String} The type of event to listen for.
         */
        getKeyEvent: function(forceKeyDown, configuredEventName){
            if (forceKeyDown || (Ext.EventManager.useKeyDown && !configuredEventName)) {
                return 'keydown';
            } else {
                return configuredEventName||this.eventName;
            }
        }
    });